ผู้วิจัยได้ทำการศึกษานำร่องโดยการส่

Researchers have made a pilot study by sending a sample of the questionnaire, with the population of people over 30 sets of Thailand do to answer the question, then, researchers have made inquiries to the understanding in answering queries and listen to feedback from respondents.

The researchers conducted a pilot study by sending questionnaires to a sample group of 30 people of Thailand to complete a series of questions. Then the researcher asked the respondents to understand and listen to the feedback from respondents.